Incandescent electric lamp.



M. H. WELSH.

INGANDESGBNT BLEGTRIU LAMP.

APPLICATION FILED MAR.16. 1910.

Patented Apr. 4, 1911.

wf/vm#` Wim/5885s v m @eM/W UNITED sfrarns rafrnrrrA orrIcii.

MAURICE H. WELSI-LOF NEWARK, NEN JERSEY, ASSIGNOR TO STANDARD ELECTRIC LAMP CO., A CORPGRATION OF NEW JERSEY.

INGANDESGENT ELECTRIC LAMP.

Specification of Letters Pa-tent.

Patented Apr. 4i, 1911.

Application filed March 16, 1910. Serial No. 549,633.

Toroll whom it may conern: j

Beit known that I, Matrimoni-I. VELsI-I, a citizen. ofthe United States", residingl at Newark, inv the county of Essex and State of NewfJersey, have invented certain Improve* ments in Incandescent Electric Lamps, of which theffollowing is a specification.

This invention relates to that class of incandescent electric lamps known vas line lights, and in Whichthe lilamentsare arranged and held each in a straight line from end to end of itself. f j

The objects of the invent-ion are toprovide insuchlamps an elongated bulb which needs to be supported` at one end only; to provide such a bulb at one end with an ordinary supporting base, adapted-'to screwV into an ordinary lamp socket, so that specialfxtures 'are not needed; toextend through the elongatedI bulb a non-incandescent conductor -for the Current and supporting inea-ns for said conduct-or and the filament at the end of the bulb opposite its supporting base;l to provide improved means for holding the filament taut when hot and expanded and allowing it to contract without breaking when cooled;

"to enable the incandescent filament to face in any direction withoutdisturbing the electrical contact of the lamp with its socket,

klao

and to obtain other advantages and results as may 'be brought out in the following description.

Referring to the accompanying drawings, in. which likevnumerals pf reference indicate corresponding parts in eachl of the several ligures, Figure l isa side View of my ime PEOVB lamp; Fig. Qis a central longitudi- -nal'section ofthe tip. of the lamp or end farthest from its support-ingl base; Fig. 3 is a cross-section takenv onl line 3, Spf Fig.i 2,

and Fig. L is an enlarged sectional'.view of lthe thermostatic'filament support, taken on line 4 4, Fig. 2, and lookin-gv inl thedirec- V tion indicatedby the arrow.

In said'drafwings, f1- indicates a tubular glass bulb of any desired' size, for 'example 'ten-or; twelve incliesklong and an inch or so in" diameter(Y ,One end Qof said: tubular bulb is rounded and closed asinv all incandescent bulbs, and at' the other end is the supporting base 3` which is eXteriorly-threaded to screw into-alamp socket (not sliewn).` The said base the terminals of the lamp,vandthe other ter,L

. neng material twith which 'rilegata-.ris

filled to a brass contact plate G-at the center of the end'of'the b aseS, as is common in in-. l

candescent bulbs,

. Vithin the tubular bulb l1 is a long slender stern 7, which I have shownas glass tubing,

although it 'might be of other material. This stem'7 can beheld in place inthe bulb in any suitable manner, but I' have sh'ownit.v

xedz at one end to the base 3 ofthe bulb,

and anchored at its other end, as at 18, to

. theinner wall of thebulb... This anchoring is preferably done by fusing an 'integrallip orprojectionofthe tube 7 to the wallv of the i bulb, as shown, so thatA theend ofthe stern is fixed or made fast to the inner wall of the bulb against any movementl with respect thereto. Through the said tubing 7 extends `a conductor 8, as copper wire, from one of Ythe lamp terminals. and at the other end of the bulb saidconductor bends laterally through the wall of the tubing 7 or a portion thereof, as 9, sufficient to attach the said conductor to the tubing. The lips 18 preferably projects from a pointof'the end edge of the tubular support 7 at one side of the opening thereof, as shown, so' asto leave the end open for. tlie,conduct0r 8. Said conductor then projects through lthe end opening of the tubular support at a distance away from said lip and anchorage, and is attached to` the end edge of the support at the opposite side of the openingV from said lip, so 4that the opening is not necessarily closed. This con- `struction is extremely simple, andv yet the anchorage of the support and lattachment; of

the conductor to said support can be independently e'ected, as described. Under some conditions,v a. graterportion of the non-incandescent conductor`8 might project from the stem. 7 than is shown in the draw-y ings, or the tubular lortion ofthe stem Y might be omitted and, t e conductor support itselfexcept at. its .opposite ends. Outside the tubular stem 7, theconductor 8 has attachedtoitsside awayfrom the supporting base. 3.0i: the bulb,y preferably by welding; an arm l0 which extends beyond the conduc- 4tor and then bends forward to have the 'adf jacent end of the filament l1 fastened' thereto in alinementr therewith, as by a carbon paste 12.` The other end ofthe filament 1I 3 comprises an outer shell 4 forming one of, platinum or the like'projecting from the otliertrminalf of. tl're base 8. througha. proiesimilarly secu-red, as atv 13, to a wire of jection 14 at the base of the stem 7. The filament 11 is put in place before the bulb is exhausted and sealed, so as to not be loose or slack to any lgreat extent when cold, and the ratio of coeiiicients of expansion of the cone ductor 8 and angular arm 10 is such that a thermostatic support is provided which un'- der the heat of the current will bend or incandescent bulbs,

4 out requiringa tot oit' special work. 30,.

swing toward the adjacent end of the bulb sufficiently to hold the filament taut and take up any slackness due to expansion' or increased length of the same when hot. The tilament is thus automatically kept taut as it is 'heated or cooled by the electric current being turned on or off.

In the drawing the angle piece 10 is of material having a lower coeiicient of expansion than the conductor S, and obviously if the anglepiece had a higher coeflic'ient of expansion than the conductor it would be se-l cured to the side of the conductor next to the far end of the filament.

A further im ortant feature 'of my' improved lamp is t at it is supported entirely from one end, by a base of the same sort as those now so commonly in use on ordinary be applied directly to ordinary fixtures witl1- In order that lgood electrical connection may be. made by the -contact plate 6, even though in order to have the -ilament l1 facing in a given direction the base 3 may not be screwed socket, a U-shaped leaf spring 16 is secured by one armi to said contact plate 6, the other arm `forming a resilient contact, as clearly shown in F' 1. [Obviously any other form of spring aga-ptedto the purpose might be employed.' f

I have used the words incandescent and @non-incandescent herein to distinguish between members which become incandescentl when the lamp is lighted and those which do not, and of lcourse do not meanl that the 'in` candescent member is always incandescent. I have also 'spoken of thel filament' as straightl to distinguish it from the usual looped filament, and mean only that it is intended to occupy. in use a substantially straight line. I have also used the expression thermostatic support as a term to eX` press the construction set forth, viz.y a support comprising longitudinal sections having different coeiiicients of expansion, whereby bending will occur upon change of temperature. l

Ilavingthus described the invention, what I claim is;

1. An incandescent electric lamp, comprising a b'ulb provided with a supporting base, an insulating tube projecting into the vbulb from said base and having an4 inner open end, a lip projecting from the edge of said open end at one side of the opening and beand hence-.the lamp can clear linto its receiving lampA the filamente'lsefiie ing mashed@ theinner will f thiebulb, a

Vnon-incandescent conductor-extending from l saidbase through said projecting from. t-he inner end ofthe tube at v a distance from said lip, another non-incandescent conductor proyectin into the bulb from said base, and an incan escent filament extending between said therewith. v u y 2. An incandescent electric lamp, com ,ris-vl ing a vbulb provided with a supporting ase,

conductors in circuity tube, said. conductor 'lav an insulating tube dprojecting into the bulb from said base an having an inner open end, a lip projecting'from theledge of said open end at one side of the o eningand be ingattached to the innerwal of the bulb, aV non-incandescent conductor extending from said base through said tube,.sai d conductor projecting from the inneropen'end ofthe tube and being anchored thereto at the opposite side of the end opening fromv said lip, another non-incandescent conductor' rojectin into the bulb from said base, and) an incan escen-t filament extending between said conductors in' circuit therewlth. y j 3. An incandescent electric lamp,'compr1s ing a bulb, nonfincandescent conducting sup-- ports terminating in saidfbulb,l andan incandescent filament extending between the-v ends of said vconducting'su ports in circuit therewith, one of said con havino` a thermostatic portion adapte when heated to Vhold the 'filament taut.

4. An incandescent electric lamp, comprising a'` bulb, a straight incandescent filament in said bulb, and non-incandescent conduct-- 'ing supports for the ends off said filament, one of said conducting supports having a thermo'static portion extendin transversely to the filamentand adapted vvv" `en heated to` bend away from the other support.

5. An incandescent electric lamp, comprising a bulb, a. straight incandescent filament in said bulb, and non-incandescent conducting supports for the endsof said filament, one of said conducting supports havi a. portion' extending transversely tothe lament and comprising ongitudinal layers whose planes. of separation are transverse to the filaments, port having ahigher coeiicient of expansionl than 'the layer away from said other support.`

ucting su ports 6. An incandescent yelectric lamp, com- 4 prising a bulb, astraight incandescent filamentin said bulb, and non-incandescent conducting suplports for the ends of Said fila.

ment, one o said conducting supports having its end portion-disposed transversely to and terminating short of itt, and an angleV piece havingl a lower coeliicient of expansion than said conductorwith one arm secured against the side vof said conductor away from the' support at the other end of -the filament and the other arm connected to said filament.

.7. Anineande'scent electric lamp, comprisincandescent filament extending between ling a bulb provided Withvua 'base having an ysaid conductors in circuit therewith, andA a exteriorly threaded outer shellanda Contact conta'tfspring,uponsaid Contact plate. 'f 1 plateinsulatedfroml said shell, n0n-incan' r MAURICE H. WELSH. 5 descentconductors-extending from said shell vIn the presencer 0f- .l

vand eontaet plate respectively intothe bulb .7. p CHA's. C. CURRY, f to different distances from thesaid-base, an vRUSSELL M. EVERETT.

Copies of this patent vmay he obtained fr'i've'centspeach, 'hy` addressing the` Commissioner of Patents, v

' l washington, D. Y

It' is hereby7 certified that Letters latent ll\lo,988,el`l6,` granted lApril 4,1911, upon the applieati'on of Manrice Welsh, olfhNewark, N evv Jersev, for an improve ment in Incandescent Electric Lamps, werev erroneousl)Y issued to Standard Electric Lanip Co., as assigneeof the entire interest-in said invention, Whereas said Letters Patent shopldhave' been issued to the inventor,v Maurice Il. yllVZsi ami Standy a/rl Electrie Lfzmp Uoljoz'm/Zi/i, said Standard Electric LnmpCo. being assignee of orte-half interest only; and that the said Letters Patent shonld be read with this eorree-tion therein that the same may conform to the record'oi the ease in the Patent [ma] f p C. e. BILLINes',

Acting Commissioner ofvPatents.

Correction in Letters lPate-nt No. 988,416.

.7. Anineande'scent electric lamp, comprisincandescent filament extending between ling a bulb provided Withvua 'base having an ysaid conductors in circuit therewith, andA a exteriorly threaded outer shellanda Contact conta'tfspring,uponsaid Contact plate. 'f 1 plateinsulatedfroml said shell, n0n-incan' r MAURICE H. WELSH. 5 descentconductors-extending from said shell vIn the presencer 0f- .l

vand eontaet plate respectively intothe bulb .7. p CHA's. C. CURRY, f to different distances from thesaid-base, an vRUSSELL M. EVERETT.

Copies of this patent vmay he obtained fr'i've'centspeach, 'hy` addressing the` Commissioner of Patents, v

' l washington, D. Y

It' is hereby7 certified that Letters latent ll\lo,988,el`l6,` granted lApril 4,1911, upon the applieati'on of Manrice Welsh, olfhNewark, N evv Jersev, for an improve ment in Incandescent Electric Lamps, werev erroneousl)Y issued to Standard Electric Lanip Co., as assigneeof the entire interest-in said invention, Whereas said Letters Patent shopldhave' been issued to the inventor,v Maurice Il. yllVZsi ami Standy a/rl Electrie Lfzmp Uoljoz'm/Zi/i, said Standard Electric LnmpCo. being assignee of orte-half interest only; and that the said Letters Patent shonld be read with this eorree-tion therein that the same may conform to the record'oi the ease in the Patent [ma] f p C. e. BILLINes',

Acting Commissioner ofvPatents.

Correction in Letters lPate-nt No. 988,416.

Correction in Letters Patent No. 988.416.

It ie hereby certified that Lettere Patent No. 988,416. granted April l, 1911, upon the application of Maurice H. Welsh, of Newark, New Jersey, feran improve ment in Incandescent Electric Lamps," were erroneously issued t0 Standnrd Electric Lamp C0., as assignee 0f the entire interest in Suid invention, whereas seid Letters Patent shoyld have been issued t0 the inventor, lL/frire lift/37e and Standard f/eclrc lamp (lowjm'm'ly, said Standard Electric linmp C0. being ziesignee of mie/aff interest only; and that the said Letters Patent should he read with this correction therein that the same may conform to the revord ot' the euse in the Patent Ofee.

Signed and Sealed this 11th day of June, A. D., 1912.

[SEAL] C. C. BILLINGS,

Actng Carfrmssoner of Patents. 

